add most mod routes

app/templates/mod/new_topic.html

@@ -0,0 +1,13 @@
+{%- from 'common/macros.html' import subheader -%}
+{%- extends 'base.html' -%}
+{%- block title -%}creating a topic{%- endblock -%}
+{%- block content -%}
+{{subheader('Create topic', 'The new topic will appear at the bottom of the current topic list. You can sort it later.')}}
+<form class="plank primary-bg full-width" method="POST">
+  <label for="name">Name</label>
+  <input type="text" id="name" name="name" required>
+  <label for="description">Description</label>
+  <textarea name="description" id="description" rows="5" required></textarea>
+  <input type="submit" value="Create">
+</form>
+{%- endblock -%}